Reading and Writing Files in Python.
This question already has an answer here: How do you append to a file? 7 answers; Python Open a txt file without clearing everything in it? 4 answers.
I would like to write to a file and then append it several times in a loop (on a windows machine). After each time I append it, I want to close the connection because I want the file to sink to a dropbox account so I can open it on other computers, while the code is running, to check the log file's status (note this condition makes this question different from any question asked on SO about.
This is implied by the first parapgraph of the doc: If you just want to read or write a file see open(), if you want to manipulate paths, see the os.path module, and if you want to read all the lines in all the files on the command line see the fileinput module. For creating temporary files and directories see the tempfile module, and for high-level file and directory handling see the shutil.
Reading files is cool and all, but writing to files is a whole lot more fun. It also should instill a sense of danger in you because you can overwrite content and lose everything in just a moment. Despite the threat of danger, we press on. Python makes writing to files very simple. With somewhat similar methods to reading, writing has primarily 2 methods for writing. Let’s get to it!
How can I keep python from overwriting an existing file, if one is created between the time of the check and the time of the open in the other thread. I can minimize the chance by randomizing the suffixes, but the chance is already minimized based on parts of the pathname. I want to eliminate that chance with a function that can be told, create this file ONLY if it doesn't exist. I can use.
How do I create a file in python without overwriting an existing file (2) Currently I have a loop that tries to find an unused filename by adding suffixes to a filename string. Once it fails to find a file, it uses the name that failed to open a new file wit that name. Problem is this code is used in a website and there could be multiple.
It will not replace an existing file whether or not the target is on the same volume. For a cross-volume move, it's effectively a CopyFile followed by DeleteFile. If deleting the source file fails, it tries to reset the file attributes and retries the delete.